rear wheel choices

I just built a front wheel.
Mavic Open Pro with Hoshi spokes on a Dura-Ace 7600 hub.
I use the bike about 3 times a month on the track for hobby events, and also daily to commute to work. So I wanted a machined wall for the front brake. That's why I decided to get the Open Pro.
No brake on the rear wheel.
What rim would be a good option in the same price range?